Your directory structures won't be exactly the same throughout both sites. What are the best practice a few things i can perform to be able to retain the majority of my existing Search engine optimization strength both in the overall domain and individual pages for searches associated with another pages?

Otherwise for the reason that same htaccess file you could include a line for every redirect. Therefore if hikingsanfrancisco.com/large-hikes has become likely to comehike.com/even-bigger-hikes the redirect would seem like:

Redirect 301 /big-hikes http://www.comehike.com/even-bigger-hikes

That 301 informs Google to now think about the new URL correct.

To redirect the entire site regardless of what towards the new URL you could utilize this:

Redirect 301 / http://www.comehike.com/

A 301 Redirect, page by page, is the greatest option (If you're able to use regular expressions is simpler). Redirect that old page to some page within the new site concentrating on the same content.
Make use of the change of address tool in the search engines Website owners tools.

Contact a number of yours recommendations to alter the hyperlinks that concentrate on your website.